Croup in the throat when lying down may be related to cardiac insufficiency, asthma, tuberculosis, etc. Patients can be treated with drugs such as deacetyl furfurazone, furosemide, montelukast sodium, isoniazid, rifampicin, etc. 1. Cardiac insufficiency: If there is left heart insufficiency, due to the impaired pumping function of the patient, the blood is stagnant in the blood vessels of the lungs, which leads to the increase of luminal secretion and the narrowing and obstruction of the airways, the patient is prone to have a croupy voice after lying down. Patients can use deacetyl furfuracein, furosemide, nitroglycerin, sodium nitroprusside and other cardiotonic, diuretic, vasodilator drugs treatment. 2. Asthma: When the patient suffers from asthma, the rales will also be produced due to the stimulation of the trachea, bronchus, pleura and other parts. Patients can be treated with montelukast sodium, salmeterol ticarcosone aerosol, etc. 3. Tuberculosis: patients with tuberculosis can also cause irritation to the trachea, pleura, etc., and the symptom of croup in the throat appears. The treatment of patients is mainly anti-tuberculosis treatment, and common drugs are isoniazid, rifampicin, pyrazinamide, etc. In addition to the above factors, there may be other causes of the symptoms, it is recommended to consult a doctor in time for standardized treatment.